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MIC2951-03BM 参数 Datasheet PDF下载

MIC2951-03BM图片预览
型号: MIC2951-03BM
PDF下载: 下载PDF文件 查看货源
内容描述: 150毫安低压差稳压器 [150mA Low-Dropout Voltage Regulator]
分类和应用: 稳压器调节器光电二极管
文件页数/大小: 14 页 / 147 K
品牌: MICREL [ MICREL SEMICONDUCTOR ]
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MIC2950/2951
Micrel
MIC2950/2951
150mA Low-Dropout Voltage Regulator
General Description
The MIC2950 and MIC2951 are “bulletproof” micropower
voltage regulators with very low dropout voltage (typically
40mV at light loads and 250mV at 100mA), and very low
quiescent current. Like their predecessors, the LP2950 and
LP2951, the quiescent current of the MIC2950/MIC2951
increases only slightly in dropout, thus prolonging battery life.
The MIC2950/MIC2951 are pin for pin compatible with the
LP2950/LP2951, but offer lower dropout, lower quiescent
current, reverse battery, and automotive load dump protection.
The key additional features and protection offered include
higher output current (150mA), positive transient protection
for up to 60V (load dump), and the ability to survive an
unregulated input voltage transient of –20V below ground
(reverse battery).
The plastic DIP and SOIC versions offer additional system
functions such as programmable output voltage and logic
controlled shutdown. The 3-pin TO-92 MIC2950 is pin-
compatible with the older 5V regulators.
These system functions also include an error flag output that
warns of a low output voltage, which is often due to failing
batteries on the input. This may also be used as a power-on
reset. A logic-compatible shutdown input is also available
which enables the regulator to be switched on and off. This
part may also be pin-strapped for a 5 V output, or programmed
from 1.24 V to 29 V with the use of two external resistors.
Features
High accuracy 3.3, 4.85, or 5V, guaranteed 150mA output
Extremely low quiescent current
Low-dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Use as regulator or reference
Needs only 1.5µF for stability
Current and thermal limiting
Unregulated DC input can withstand –20V reverse battery
and +60V positive transients
Error flag warns of output dropout (MIC2951)
Logic-controlled electronic shutdown (MIC2951)
Output programmable from 1.24V to 29V (MIC2951)
Automotive Electronics
Battery Powered Equipment
Cellular Telephones
SMPS Post-Regulator
Voltage Reference
Avionics
High Efficiency Linear Power Supplies
Applications
3
Block Diagram
Unregulated
DC Supply
FB
IN
OUT
Error
Amp.
182k
SNS
TAP
330k
5V/150mA
Output
SHDN
TTL/CMOS
Control Logic
Input
60mV
60k
Error Detection
Comparator
ERR
1.5µF
GND
TTL/CMOS
Compatible
Error Output
1.23V
REF.
MIC2951-0x
February 1999
3-49